Note 11 - Income Taxes (Detail) - Provision for federal and state income taxes (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current income tax expense:
Federal	$ 22,368	$ 18,393	$ 34,531
State	11,456	13,322	13,075
Total current	33,824	31,715	47,606
Deferred income tax (benefit) expense:
Federal	(7,280)	1,839	(10,155)
State	(1,114)	(626)	(606)
Total deferred	(8,394)	1,213	(10,761)
Provision for income taxes	$ 25,430	$ 32,928	$ 36,845